ET MALWARE Win32/Avaddon Ransomware Style External IP Address Check

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Avaddon Ransomware Style External IP Address Check";
    flow:established,to_server;
    urilen:1;
    http.method;
    content:"GET";
    http.user_agent; bsize:7;
    content:"WinInet";
    http.host;
    content:"api.myip.com"; fast_pattern; startswith;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|";
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|";
    reference:md5,c9ec0d9ff44f445ce5614cc87398b38d;
    classtype:trojan-activity;
    sid:2030253; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_05, deployment Perimeter, deployment SSLDecrypt, malware_family Avaddon, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_10, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)